diff --git a/src/rcore/modes.rs b/src/rcore/modes.rs
index d855e92..e8b6f2d 100644
--- a/src/rcore/modes.rs
+++ b/src/rcore/modes.rs
@@ -30,7 +30,6 @@ pub trait FactoryProxy<'a, Ctx: Context<'a>> {
 impl<'a, Ctx: Context<'a>, F: FactoryBase<'a, Ctx> + WithParseMode> ParseFactory<'a, Ctx> for F
 where
     F::WithMode: FactoryProxy<'a, Ctx, F = Self>,
-    F::Mtbl: MentionableTop<'a, Ctx>,
 {
     fn deserialize(&self, inctx: impl InCtx<'a, Ctx>) -> ParseResult<'a, Ctx, Self> {
         <F::WithMode as FactoryProxy<'a, Ctx>>::pdeserialize(self, inctx)